Solid material comminution or disintegration – Processes – Wood and similar natural-fibrous vegetable material
Patent
1997-01-31
1998-11-17
Rosenbaum, Mark
Solid material comminution or disintegration
Processes
Wood and similar natural-fibrous vegetable material
2412612, 241296, 241300, 427446, B02C 712
Patent
active
058365257
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a filling for a pulp refiner such as a refiner for paper pulp, to a refiner including at least one such lining, to a process for the preparation of this filling and to a refining process in which at least one such filling is employed.
STATE OF THE ART
It is known to perform the refining of pulps such as paper pulps by passing them through a refiner. Refiners for paper pulp are fitted with a rotor and a stator between which the raw material is defibered and fibrillated. There are two main categories of refiners: disc refiners and conical refiners.
Disc refiners generally include one or more rotors and one or more stators, each consisting of a support disc on which another disc, called a refining disc is fitted, the function of which is, at the same time, to protect the support disc from erosion by the raw material to be refined and to participate in the refining of the latter.
During the refining the raw material can be introduced via the centre of at least one of the refining discs into the space situated between the two refining discs and can flow towards their periphery. It can also be introduced at the periphery of the discs and come out at the centre of the discs. In the course of either of these circulations the pulp undergoes a treatment which considerably modifies the physical properties of the fibres present in the pulp and subsequently enables the paper manufactured from the treated pulp to have the characteristics that are necessary for the use for which it is destined.
As shown in FIGS. 1 and 2, the refining discs generally comprise a face 1 for securing to the refiner and a working face 2 including an alternation of grooves 3 and of projections, called blades 4. The active surface 5 of these blades 4 wears away gradually during the refining, with the result that the refiner must be stopped at regular intervals and the refining discs must be replaced.
Refining discs which are currently employed are either discs which have a complete annular shape and which are cast as a single component, like a torus-shaped member (FIG. 1), or discs, illustrated in FIG. 3, which are made up of a number of segments 6 and which together form a ring.
Conical refiners generally include a rotor 7, shown in FIGS. 4 and 5, of conical or frustoconical shape, and a stator 8, shown in FIGS. 6 and 7, also of conical or frustoconical shape. Refining cones or conical frustums 9 and 10 are fitted, respectively, on the external surface 11 of the rotor 7 and on the internal surface 12 of the stator 8. These refining cones or conical frustums 9, 10 may be made up of segments 13, 14 respectively. They comprise an alternation of grooves and blades (not shown) and play the same part as the refining discs referred to above.
During refining in a conical refiner the raw material is introduced between the stator and the rotor of the refiner, at the top of the cone or conical frustum forming the rotor and comes out at the base of this same cone or conical frustum.
Given that the refining discs or cones must resist wear, they are generally made of a metal or of a metal alloy which exhibits a high hardness.
In order to improve the effectiveness of refining of paper pulp which is carried out with the aid of such metal discs or cones, research which is at present being carried out deals with the modification of the geometry of their working face and with the nature of the metal or metal alloy.
Thus, International Application No. WO 90/04673 proposes a process for the manufacture of fibre pulp in which a starting material containing lignocellulose is defibered and fibrillated between the blades of two grinding discs facing each other and, according to which, in order to improve the refining, the blades have been inclined at an angle of 5 to 30 degrees relative to the radius of the discs on which these blades are situated.
However, this process still does not enable the quality of the pulp obtained to be improved sufficiently.
In the course of its investigations the Applicant Company found that the quality of the r
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M. Sferrazza, "Proper Refiner Selection, Upkeep Boosts Performance and Savings", Issue Focus: Mill Maintenance I.
Caucal Guy
Garnier Yves
A.R.T.E. Parc Equation
Rosenbaum Mark
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